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Here is a list
of cover versions which might be useful to you. If you have any information you could provide about the singer (male/female, nationality, any idea of how old the version might be etc.) that might make it easier to narrow down. This version
by Amanda Zullo sounds like it might be a match at least based around being a quieter version of the song.
I found it. It's here
and it was released in 2007. Apparently, Barry Manilow also made this version.

I’m trying to find a cover of “Copacabana” that is distinctively quieter than the others. It doesn’t have trumpets or anything of the sort, but it does have an acoustic guitar. I keep hearing it, but whenever I try to Shazam it, it shows Barry Manilow’s original version.
EDIT: I found it: https://youtu.be/8_48DLTQfY8
. Barry Manilow also made this.
Edited by sudrictoon